Another attempt to fix file IO permissions under Mac

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28485 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fixed problem with IE not showing MenuBar when working over file://

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28486 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3629 fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28488 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Don't ask overwrite question twice

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28489 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix for #3617, other fixes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28490 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e